News outlets report that Sills said an inmate released from jail last month informed authorities that Roberson was having sexual contact with a woman in custody. The sheriff's office installed a camera and captured an alleged sexual encounter between Roberson and the female inmate earlier this week.

Roberson was charged with sexual assault by a person with supervisory or disciplinary authority, aggravated sodomy and violation of oath by a public officer. It's unclear if he has a lawyer who could comment.